The Summy Company, working with the authors, copywrited it in 1935, then Warner bought them out and inherited all their intellectual properties. The copywrite expires in 2030. No different than any other copywrited music, so get over it.

I guess since Prenda is circling the drain, this will have to due until the next troll rears its ugly head.

The folks suing have a very sound argument, which if it holds up will no doubt invalidate that 1935 copyright.